Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Accuracy requirements

Greater accuracy of estimation may be achieved, within limits, by the expenditure of more time and money. The greater the accuracy required, the greater the time and effort needed to obtain the design and cost data prior to making the estimate. [Pg.862]

The three principal methods of batch proportioning are accumulative, sequential, and simultaneous the best method for a given appHcation depends on the processing equipment available and the accuracy required. [Pg.334]

The nozzle, in which the fluid is gradually accelerated up to the throat of die instrument but expansion to pipe diameter is sudden as witii an orifice. This instrument is again expensive because of the accuracy required over the inlet section. [Pg.244]

The requirement for procedures does not stipulate that they need to address all 30 requirements of this section of the standard. Procedures are required only for the control, calibration, and maintenance of these devices. The requirements in clause 4.11(a), for instance, requiring you to determine the measurements to be made and the accuracy required, are not requirements concerning the control, calibration, and maintenance of these devices. They are requirements concerning measurement. The procedure requirement only addresses the devices used for measurement and therefore does not apply to software other than software used for measurement. [Pg.399]

In summary, when considering alternative processes for producing plastic and RP products, the major concerns usually involve (1) limitations that may be imposed by the material, because not all materials can be processed by all methods (2) limitations imposed by the design, such as the size, singlepiece versus multiple-piece construction, a closed or open shape, and the level of dimensional and tolerance accuracy required [Pg.563]

In [13], an efficient residual error estimation scheme has been introduced for controlling the quality of the approximation. This gives us a stopping criterion for the iteration guaranteeing that the quality of the approximation fits to the accuracy requirements of the stepsize control. [Pg.405]